package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

@Service
public class OrderServiceImpl implements OrderService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;

    /**
     * 用户下单
     * @param ordersSubmitDTO
     * @return
     */
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {
        // 处理各种业务异常(地址簿为空、购物车数据为空)
        // 地址簿不存在异常
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if(addressBook == null) {
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }
        // 购物车为空异常
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(BaseContext.getCurrentId())
                .build();
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if(shoppingCartList == null || shoppingCartList.isEmpty()) {
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        // 向订单表插入一条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setUserId(BaseContext.getCurrentId());
        orders.setAddress(addressBook.getDetail());
        orderMapper.insert(orders);

        // 向订单明细表插入多条数据
        List<OrderDetail> orderDetailList = new ArrayList<>();
        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart, orderDetail);
            orderDetail.setOrderId(orders.getId());
            orderDetailList.add(orderDetail);
        }
        orderDetailMapper.insertBatch(orderDetailList);

        // 清空当前用户的购物车数据
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());

        // 封装VO返回结果
        return OrderSubmitVO.builder()
                .id(orders.getId())
                .orderNumber(orders.getNumber())
                .orderTime(orders.getOrderTime())
                .orderAmount(orders.getAmount())
                .build();
    }

    /**
     * 订单支付
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

        //调用微信支付接口，生成预支付交易单
        JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), //商户订单号
                new BigDecimal(0.01), //支付金额，单位 元
                "苍穹外卖订单", //商品描述
                user.getOpenid() //微信用户的openid
        );

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);
    }

    /**
     * 历史订单查询
     * @param page
     * @param pageSize
     * @param status
     * @return
     */
    public PageResult getHistoryOrders(Integer page, Integer pageSize, Integer status) {
        PageHelper.startPage(page, pageSize);
        OrdersPageQueryDTO ordersPageQueryDTO = OrdersPageQueryDTO.builder()
                .userId(BaseContext.getCurrentId())
                .status(status)
                .build();
        Page<Orders> orders = orderMapper.pageQuery(ordersPageQueryDTO);
        List<OrderVO> orderVOS = new ArrayList<>();
        for (Orders order : orders) {
            OrderVO orderVO = new OrderVO();
            BeanUtils.copyProperties(order, orderVO);
            orderVO.setOrderDetailList(orderDetailMapper.getByOrderId(order.getId()));
            orderVOS.add(orderVO);
        }
        return new PageResult(orders.getTotal(), orderVOS);
    }

    /**
     * 获取订单详情
     * @param id
     * @return
     */
    public OrderVO getOrderDetail(Long id) {
        OrderVO orderVO = orderMapper.getOrderDetailById(id);
        orderVO.setOrderDetailList(orderDetailMapper.getByOrderId(id));
        return orderVO;
    }

    /**
     * 取消订单
     * @param id
     */
    public void cancel(Long id) {
        Orders ordersDetail = orderMapper.getOrderDetailById(id);
        if (ordersDetail == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        if (ordersDetail.getStatus() == 2) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        ordersDetail.setStatus(Orders.CANCELLED);
        ordersDetail.setCancelReason("用户取消");
        ordersDetail.setCancelTime(LocalDateTime.now());
        orderMapper.update(ordersDetail);
    }

    /**
     * 再来一单
     * @param id
     */
    public void repetition(Long id) {
        // 处理各类业务异常
        // 订单不存在异常
        Orders orders = orderMapper.getOrderDetailById(id);
        if (orders == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        // 将相应菜品插入到购物车
        List<ShoppingCart> carts = new ArrayList<>();
        List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(id);
        for(OrderDetail orderDetail : orderDetails) {
            ShoppingCart cart = new ShoppingCart();
            BeanUtils.copyProperties(orderDetail, cart);
            cart.setUserId(BaseContext.getCurrentId());
            cart.setCreateTime(LocalDateTime.now());
            carts.add(cart);
        }

        // 将购物车信息插入到数据库
        shoppingCartMapper.insertBatch(carts);
    }

    /**
     * 分页查询
     * @param ordersPageQueryDTO
     * @return
     */
    public PageResult pageQuery(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 统计订单数据
     * @return
     */
    public OrderStatisticsVO statistics() {
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setToBeConfirmed(orderMapper.countByStatus(Orders.TO_BE_CONFIRMED));
        orderStatisticsVO.setConfirmed(orderMapper.countByStatus(Orders.CONFIRMED));
        orderStatisticsVO.setDeliveryInProgress(orderMapper.countByStatus(Orders.DELIVERY_IN_PROGRESS));
        return orderStatisticsVO;
    }

    /**
     * 模拟支付成功(小程序端会报错)
     * @param orderPaymentVO
     * @return
     */
    public OrderPaymentVO pay(OrdersPaymentDTO ordersPaymentDTO) {
        paySuccess(ordersPaymentDTO.getOrderNumber());
        return new OrderPaymentVO();
    }

    /**
     * 确认接单
     * @param ordersConfirmDTO
     */
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();
        orderMapper.update(orders);
    }

    /**
     * 拒单
     * @param ordersRejectionDTO
     */
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) {
        Orders orders = Orders.builder()
                .id(ordersRejectionDTO.getId())
                .status(Orders.CANCELLED)
                .rejectionReason(ordersRejectionDTO.getRejectionReason())
                .cancelTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);
    }

    /**
     * 取消订单
     * @param ordersCancelDTO
     */
    public void cancelByAdmin(OrdersCancelDTO ordersCancelDTO) {
        Orders orders = Orders.builder()
                .id(ordersCancelDTO.getId())
                .status(Orders.CANCELLED)
                .cancelReason(ordersCancelDTO.getCancelReason())
                .cancelTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);
    }

    /**
     * 派送订单
     * @param id
     */
    public void delivery(Long id) {
        Orders orders = Orders.builder()
                .id(id)
                .status(Orders.DELIVERY_IN_PROGRESS)
                .build();
        orderMapper.update(orders);
    }

    /**
     * 完成订单
     * @param id
     */
    public void complete(Long id) {
        Orders orders = Orders.builder()
                .id(id)
                .status(Orders.COMPLETED)
                .build();
        orderMapper.update(orders);
    }
}
